Related Clues:

• Evidence of changes
• Crossword solvers' smudges
• Signs of censorship
• Wipeouts
• Errata reducers
• What smudges may indicate
• Some rub-outs
• Deletions
• Certain strikeouts
• Wipeouts?
• Blank spaces, perhaps
• Evidence of revisions
• Evidence of errors
• Indications that things have changed?
• Slate-cleaning acts